Railway brake operated by fluid pressure



RAILWAY BRAKE OPERATED BY FLUID PRESSURE Filed March 21, 1928 consistsof compressed air. More lspecically` 5 our invention relates'to thattype of disclosed inour prior Patent No.f1,663,579,

Patented Feb. 25,-,1930

" UNITED/STATES i.ANDERSANDEIIRBERG AND' ERIK ANDERS ANDERBERG,OF'MALMO, SWEDEN, ASSIGN- ORS TO CAR-L HOLMBERGS MEKANSKA, VERKSTADSAKTIEBOLAG, OF AllhU'ND" SWEDEN, A CORPORATION OF SWEDEN RAILWAY. BRAKEor'iiiiArnn BY nnninrnnssnnn Application sied narnarisas, semi No.263,336, mi in sweden Marchaaisa?. v

y y Our invention'relates to improvements in railway brakes actuated byfluid pressure, in which brakes the actuating fluid generally brakesgranted March 27, 1928, and comprising two operating devices ofdifferent types, one of them being a quick-action brakehaving a y 18 andemployed for applying the main braking pressure to the shoes'.

` The present 'invent'on has for its object tor` simplify and improvethe means formounting the two brake devices together, and gen'- sions ofthe whole brake structure especially in the direction of length, i. e.'in the direction of the braking movement.

In our prior patent referred toabove we have explained that themainbrake device, i.l e. the modied two-chambercompressed air H'brake,mayconsist of two or morel pistons. having differentareas inorder tomake it possible, by using "oneor more-,of such pistons, to vary thebraking action of each diferentcar in a train' according tothe loadcarried by the different ,cars",`and: in such instance, the inven- -tioninvolves certain specialadvantages as will be more'fully described inthefollowing.

v s connections lbetween the diiferent parts of the .assembly arediagrammatically shownin dot anddash lines. `LFurther .it is t beunderstood l fthatfthe triple valve Cis shown in combinai tionwithvtheacceleratingy andi-other devices The Y invention is vdiagrammaticallyillustrated in the accompanying* drawing which shows a sectionalelevation ofthe same. v 4

v Referringv to the drawing -thegeneral reference letter A representstheauxiliary reser- Y voir, and Misthem'ain brake pipe. nB is the ,ocombined brake structure Iand C .the `triple valve,

y which latter is drawnftoa very 'much 'larger scale.'v than the other.parts.

Ddescribed in our copending lapplications u Nos. 243,1-34- andl2l5,540led, respectively, Deceiber28, 1927, and January 29,1928 and relativelysmall braking power and employed erally the intention is to reduce thedimen- The pipe l latter. Such-.valve structure is described in patent`and ,c

'triple valve or not.`

In the embodiment ofinvention shownj'in I thedrawing thequick-.actionbr'ake comprises a single-chamber airrbrake having a piston1 secured to the pistonl rod' 9, which 'extends centrally through thepiston'of the modified two-chamber brake. Y 7 e f For thepurpose ofmaking it possible to dispense with the tighteningmeans between thedifferent pistons of the two-chamber brake and for reducing thedimension in the direction of length, thefpiston of the said twochamberbrake given the forni' ofadiferentialpistonjhaving 'alsmaller sizedpartr2'` y'anda larger sized part-3, which piston parts are rigidlyconnected to each other fand tighty ened in the `corresponding shapedcylinder against pressures in both directions, the tightening meansbeing of the usual kind and wellV known to those skilled in the art.Thecylinder, ,within which f' the differential' piston lmjoves, consistsof two differently sized parts,

i. e. asmaller sized cylinder t'directly connectc ed to va larger sizedcylinder 5. v n

It will be obvious that the differential piston may also be made of morethan two diEerently sized parts ,if desired, underthe condi-` tion thatthecorresponding cylinder is provided with a corresponding number ofdierent diameters, but for allpractical purposes a two-part differentialpiston will be yentirely sufficient.

, The smaller cylinder 1 is provided'withan air inlet 6 atthat endfacing the quick-action braking device and the 'larger sized cylinderVThe valve member. ,V controlling the inlets tionbrake is arrangedatthefree endofthe` ourl previously-mentioned prior requires no specialdescription in this connection, For the sakeof. clearne'ss, yitis drawnthe drawing.

V5 is provided :with an-inlet'at each end, such Y V"inlets beingdesignated 7 and 8. 590; v

to alarger .s calethanthebrake structureit-i f self, and in practice itvis-.v'ery much smaller .than indcatedby the proportions shownjinio fThe dilerential piston 2, 3 is arranged on a sleeve 11 surrounding thepiston rod 9 of the quick-action brake. Y

For the purpose of reducing the axial di- 5 mansions the return spring12 of the twoehaniber brake is not arranged in the usual waywithin thecylinder of said brake, but it is arranged externally of thesanie'bel Y-tween `thepistonV Q-L-and a washer 13 f aftifxed to the sleeve' 11, andisvplaced 'within afhousing consists of three `different vparts`comprisi'ngan` yordinary rod-likepart 9 nearest to the Apiston,"an4intermediate"serrated 'part Sa and an Aouter sleeveshapedfpart 9b, "allthe'separts 'being rigidlyz conne'ctedto each other. iThe" intermediate'serrated part 9EL -is secured V'in the inner end of the`sleeve shap`ed.'part 9b andv the llatter"surrounds Connecting rod 21't`or connectionwith the brake rigging, such rod beingloosely inserted: within'the"sl'eeve9b and abutting against thead- `jacent endL of theintermediate parti)a the 'a'buttingsnrfaces preferably'beingV rounded RSindican-fd in the drawing.

`ThelookingV device'between the different 'pistons consists of one, yormore knee 'link systems `tor Veoaction' with the' 'serratedpart '9i1ofthe piston rod, andan the case ot' 'two 'or more such systemsbeingnsedtheparti?EL is' tov be provided with a correspondingnum- Sher'of serrated y'or rack-like portions.

The "sleeve f 11 penetrating thetwo-c'liainberfbrake piston'withinthe'ehamber 14 is provided with a head 22,11. parto'f which 'formsthe 'washer 13 described above; and

part 9a, is provided Vwith pivot pins QBand Thefpin carries a two-:armedlever, :one arm otwhich is connectedV by means oit al tension spring'QGtoa fixed .point on the head 22 Vloeatedf'adjacenti to 'the washer13,

'the other arm` QTSCarr'yingFa vpivot pin 28 f link system, such'y linkbeingprovided'witlr a 'l the `seond Vlink 32i otL the knee link system,wliehlastmntioned.linkispivotally mount- 'fentmentgisformee'eeaeiby' the@over of the li'oiisingl'lll nearest' tofjthe uniek-faction; brake.

system 29, 32, s o that the pavvl 3 0Venters into lengagement "with thetoothed rack 4portion 9a, 'thereby .locking the pistons together.

` WlienY the two-chamber brake piston IDOVBS in the opposite direction(releasing lthe brakes), the release'ofthe'locking means willtakefiplaee 'in thel reverse'mannerras soon as the lever arm 27 comes inContact with the It Ais toA be seen from the drawing that the paw'l 30has been given awrking edge, the sides of V whiehare disposedsubstantially at 'riglit'ang'lesl to each' other,l andA atan" angle of'about F45" "to Ythe axis ofthe 'pist-on; 'rod whenengaging the' latter,the'serr'ations of ber brake'piston will automatically 'tend to 'pressthepawl against 'the piston rod 'when'it fhasoriee been brought? into"engagement by means ofthe spring Qtand-afoorrect` inclination of the'venacting surifacesof the-pawland the' Arack will ventirely unload" thespring, so thatztihe same need not be reliedonf for main- Ijtaining thelocking action between the 'members described. Further, "theconstructionmayalso be carried out in such a waythat the lost-motion ofthe two-ehamber brake` piston toi" establishing the looking action isl'very "small and without importance.

"Vlvihat 'Weelaiz'n and desire' to secure by Let` J"te'rsPatent is":-

'1. VIn 'auidactuated railwayl brake,l two Voperating devices' of'different tkinds acting upon a" common "piston: rod, onefof" said de-"vlees Consisting of'a" brake actuatorhaving this' head,` at opposites1des 'ofthe' piston rod "power, 'while the" other eonsistsf,V of a"twochamber Aairlorake' actuator provided 'with' a differential piston'reciproeably mounted within 'a' corresponding cylinder, ln'eans vforeonneoting th'esaid cylinder' at the outer side ofl the piston parthaving the greater area withl the main pipe, and-means` for independentconneetion of the cylinder/at'the opposite 'iside of the said pistonandVv 'atf theV "outerside of the 'piston lhavifn,g f 'th'esmaller area"with the aixiliary reservoir.

'2. In l af-fluideactu ated "railwayf brake, "two operatingdeviees ofAdifferent kinds "acting 'upona commonpistonrod, oneof'said delto vfjlogtain fthe"desredf operation it 1s also es-j 'sentiallthat'a fixedabutment beplaCed in vices Consisting' of a" brake "atuator khaving'quick a'ctionand trelatively .snall'braking power, wliile theother'consistsjo- Aa two- "chamber air bra-ke 'actuator'provided "with adierential piston reciprocaloly -niounted 'within a Y correspondingcylinder, a toothed rack Aimb'ine'd 'with'. the )common "piston "rod, "a'pawlfeonibined yv vithithe dilfereti'alpis- "ton *and jadapted for.gcoafc'tion l:with ssaid toothed lack `v"for releasably ,lokingthedif-Y within a corresponding cylinder,

ferential piston to the same, means for establishing the lockingactionat the beginning of the working stroke of the diiierential piston,

v and means `for releasing the same at `the return stroke of saidpiston.

' tion with the said toothed rack, a sleeve member connected withl thedifferential piston and penetrating the centre of the same and survrounding the common piston rod, an intermediate housing connecting thetwo operating devices, a flange-shaped vmember aiiixed to said sleevemember and located within said housing, and a return spring for thediiferential piston interposed between said flange-y shaped member and awall of said housing.

4f. In a fluid-actuated railway brake, Vtwo different operating devicesof different kinds acting upon a common piston rod adapted forconnection with the brake rigging, one of said devices consisting of abrake actuator I- having quick action and a relatively small Y brakingpower,

.while the other lconsists of a two-chamber air vbrake actuator providedwith a differential piston reciprocably mounted within a correspondingcylinder, a toothed rack combined withthe common piston rod, a sleevemember affixed tothe differential piston and penetrating the centre ofthesame and surrounding thecommonjpiston rod, an intermediate housingconnecting the two operatingdevices, a head Von saidsleeve memberlocated within said intermediate housing, aV

kneey link system pivotally connected with said headLone of the links ofwhich forms a pawl for engagement with the aforesaid toothed rack, alever connected with lsaid knee y linksystem and coacting with a fixedabutment within said housing for releasingV the locking engagementbetween said pawl and said toothed rack at theV return lstroke of `thedierential piston, and a spring acting upon said lever for establishingthe locking engagement at the working stroke of the vdiil'erc l names tothis specification. Y

ential piston.Y v

l5. Ina fluid-actuated ,railwayy brake, two

L Voperating devices of different Vkinds acting upon a common pistonrod, one of said derack combined with the common piston rod, a pawlcombined with the diierential piston and adapted for coaction with thesaid toothed rack for releasably locking the differential piston to thesame, means for establishing the locking action at the beginning of theworking stroke of the differential piston, and means for releasing thesame at the return stroke of said piston.

6. In a fluid-actuated railway brake, two operating devices of differentkinds acting upon a common piston rod, one of said devices consisting oa single-chamber air brake lactuator having a relatively small brakingpower, while the other-consists of a two-chamber airl brake actuatorvvprovided with a differential piston reciprocably mounted within acorresponding cylinder, an intermediate housing connecting thesingle-chamber air brake cylinder body with the. cylinder body of thetwo-chamber air brake actuator, a sleeve member ai'ixed tothedifferential piston and penetrating the centre of the same and extendinginto said intermediate housing, a toothed rack combined with the commonpiston rod, a locking pawl combined with the party of the sleeve membereX- tending into said housing, means for establishing pawl and and saidtoothed rack at'the beginning of the working stroke of the difierentialpiston, and means for releasing said engagement at the return stroke ofsaid piston.

7. In a Huid-actuated railwayk brake, twoA operating devices ofdifferent kinds acting a locking engagement between said` l, y

upon a common piston rod, one of said del vices consisting of asingle-chamber air brake actuator, the piston lof which is secured .tosaid piston rod,while the other consists of a two-chamber airbrakeactuator having a differential piston adapted tobe releasablyconnected with said common piston rodand reciprocably mounted within vacorresponding differential cylinder, a toothedvrack combined with thecommon piston rod, a pawl combined with the differential piston' andadapt-v ed for coaction with said toothed rack,lmeans for establishingthe locking engagement bep I tween said pawl and said toothedrrackat'the beginning of the working stroke of the differentialpiston, andmeans for-releasing said locking engagement at the return strokek of`said piston.

In testimony whereof we have signed our.

Y ANDERS ANDERBERG.' v

ERIK ANDERS .ANDEREERQ vices consisting of# a single-,chamber air brakeactuator having a relatively small braking 'power2 while the otherconsists ofV a A' two-chamberair brakeactuatorprovidedwith p a.differential pistonlreciprocably'mounted p Vwithin a correspondingcylinder, a toothed

